Film checking device for synchronized sound pictures



Feb. 5, 1935.

c. CRETIN 1,989,971

FILM CHECKING DEVICE FOR SYNCHRONIZED SOUND PICTURES Filed July 6, 1929 UEIDDUDUUEIDEIUU I 1 E x.

DDDDDUDDEIUUDUUD INVENTOR CHkRLES CRETIN ATTOR N EY Patented Feb. 5, 1935 1,989,971

UNITED STATES PATENT OFFICE FILM CHECKING DEVICE FOR SYNCHRO- NIZED SOUND PICTURES Charles Cretin, Berlin, Germany, assignor to Telefunken Gesellscliai't fiir Drahtlose Telegraphic m. b. 11., Berlin, Germany, a corporation of Germany Application July 6, 1929, Serial No. 376,337

4 Claims. (01. 177'311) In the production of synchronized talking mov- Having thus described my invention, I will now ing pictures, it is necessary to check up the length describe its operation. The film 1, which is to of a relatively large. number of copies with conbe checked up, travels over the contact plate 2. siderable accuracy in order to ascertain, in the The contact rollers 3 engage the contact plate 2 case of a difference in the length of the. copies, through the holes 4 in the film and are adapted 5 just where such differences exist. r to close the corresponding contact for the lower It is the object of this invention to provide signal lamps 14. These holes are staggered a system and means for accomplishing this checkin relation to one another so that the four rollers ing of the films. 3 are caused to contact with the contact plate in Other objects and uses of this invention will besequence. The upper lamps or indicating devices 10 come apparent from the following specification l 4 serve for checking the film. They are actutaken in connection with the appended drawing. ated by the contact device 5 in such a manner that, For the purpose of this invention, a measurat each tenth picture, one of the upper lamps is ing device is used which not only indicates the caused to flash up. Since the counter device 5 measured length of the film in the term of units is in positive coupling relation with the driving 15 upon a scale, but which, say, upon each tenth sprocket 6, an arrangement can be made so that picture, causes the flashing of a number or some the contact maker will synchronize with the conother indication upon an indicator board or panel. tact making of the rollers 3 and the contact plate Attention is now invited to the accompanying 2, with a result that the lower and the upper lamps drawing in which: 14 will flash up simultaneously. Thus the re- 20 Fig. 1 is a schematic diagram showing the lationship between the measured length of the checking device in accordance with the present film and the actual appropriate films is continuinvention. ously indicated.

Fig. 2 is a plan view of the checking device and The best plan is to provide the holes 4 after the film for cooperation therewith, which more every tenth picture, so that the flashing of indiclearly illustrates its action. vidual lamps will occurat intervals of about one Referring now more particularly to Fig. 1, the second, assuming a travel of ten pictures per secfllm 1 passes over the contact plate 2 as driven 0nd. Thus the holes 4, 4, 4", 4 are not proby the sprocket 6. There are arranged the rollers vided after every consecutive picture, as shown U0 3 for contact with the contact plate 2 through in Fig. 2, for the purpose of illustration, but after the holes 4 which are punched in the film 1 at every tenth picture. regular intervals. These holes are staggered Whenever an irregularity arises as a consefrom right to left so that the various rollers 3 quence of gluing or tearing or mending, this will will contact in sequence with the plate 2. Geared become evident from the irregularity in the flashto the driving sprocket 6 by an appropriate aring of the lower bank of lamps compared with the 35 rangement is a contact maker 5 which is.adapted upper bank of lamps, as will be clearly understood to close a series of circuits in the same sequence from the above description. The total length of as the contact rollers 3 in connection with the t m can be counted separately by t aid 0f contact plate 2. Also geared by an appropriate the Counter device 7 arrangement to the sprocket 6 is the counter 7 Having thus described my invention, it is to be 40 for counting the length 0f travel of the film Over understod that I am not to be limited by the form F fi are providefl two banks shown and described for the purpose of illustraof indicating devices 9 and 10 having numerals non only, but by its scope as Set forth in the 1-4, the lower, 10, of which is so connected that pended claims its indicators are actuated in sequence by the con I 1 45 tact rollers 3 and the contact plate 2. The upper 0 bank. of indicators, 9, is adapted to have its cir- A film checkmg ,devlce mcludmg cuits closed by the contact maker 5 in the same port means for mPvmg film,over Said Sixpsequence by means of suitable electrical connecport means coordinated f Sald q g tions as Shown means for producing a series of successive indi- 50 Referring now more particularly to Fig. 2, the cations repeated in the same order, and means fllm 1 is shown with a seriesof holes 4, 4', 4", 4", p rating with the film at t e Supp for D staggered from left to right, respectively, more ducing a similar series of indications when the clearly showing how the contac rollers 3 are concontinuity of tie subject-matter of the film is nected with the contact plate 2 in sequence. not interrupte and for producing a different se- 55 2 1,989,971 :ries of indications when said continuity is interrupted.

2. A film checking device including film moving means, means coordinated with said film moving means for producing a series of indications, indicating devices and control means coordinated with the film for causing said indicating-devices to produce a series of indications similar to the first series when the continuity of the subjectmatter of said film is not interrupted and for producing a difierent series of indications when matter of said film is not interrupted and to produce a different series of indications when said continuity is interrupted, and means for indicating the length of film checked previous to said interruption.

4. A film checking device including film moving means, means coordinated with said film moving means for I oducing a series of indications, indicating devices and control means coordinated with the film'for causingsaidindicating devices to produce a series of indications similar to the first serieswhen the continuity of the subject-matter of said film is not interrupted and to produce a difierent series ofvindications when said continuity is interrupted, and means operable to indicate at any instant the length of film checked.

CHARLES CRETIN. 

